724results about How to "Improve breaking capacity" patented technology

A contact apparatus is provided having a permanent magnet disposed in a region where a fixing contact point is mounted to a fixing contact and a movable contact to which a movable contact point is mounted. An arc generated between both the contact points is moved in a lateral direction by the magnetic force of the permanent magnet and stretched. An arc-extinguishing member which is heated by the arc for generating arc-extinguishing gas is provided such as to surround the fixing contact point and the movable contact point.

A metal workpiece is cut by rotating the workpiece while pressing the cutting edge of a cutting insert thereagainst for removing a chip from the workpiece. A first liquid jet is directed from a first nozzle toward an upper surface of the cutting insert for creating an hydraulic wedge between the cutting insert and the chip, and a second liquid jet is directed from a second nozzle toward a target point disposed above the upper surface of the cutting insert to engage and deflect the chip upwards and backwards.

A parallel circuit breaker is provided, which belongs to a high-voltage high-capacity circuit breaker and is to provide automatic current equalization and current limitation and realize the parallel operation of a plurality of arc-extinguishing chambers. The invention comprises parallel-connected 2-4 shunts each comprises an inductance coil and an arc-extinguishing chamber of switches in series connection, wherein the induction coil is enwound around a share iron core to form a coupling inductance coil and the turn number of inductance coil of each shunt is the same. The system current flows through the inductance coils of the 2-4 parallel-connected shunts individually and the arc-extinguishing chambers in series connection with the shunts. The magnetic flux of the magnetic circuit produced by the interaction between the iron core and the inductance coil of each shunt is opposite to that of the other shunts. The arc-extinguishing chamber of each shunt has high capacity, 2-4 parallel-connected arc-extinguishing chambers share the parallel-connected arc-extinguishing chamber device controlled by the same system, or are connected in parallel by 2-4 separated circuit breakers. Based on the structure of the coupling inductance, the invention realizes the parallel-connected on-off of a plurality of arc-extinguishing chambers of the circuit breakers and improves the capacity of on-off of the whole circuit breaker.

The invention relates to an external hanging combined vacuum on-load tap switch, comprising a case, a tap selector, a switching means assembly, a transmission device, and one electric operation mechanism, wherein one lateral side wall of the case is provided with a connecting terminal connected with the coil tap of a transformer; the external side of the wall is provided with a first flange plate and is connected with a second flange plate of the transformer; the tap selector and the switching means assembly are arranged inside the case in parallel; and the electric operation mechanism is connected with the transmission device and drives the tap selector and the switching means assembly to achieve tapping and switching through the transmission device.

The invention discloses arc extinguish chambers of a high voltage alternating current SF6 pot-type breaker. The invention is characterized in that an arc extinguish chamber system comprises a shell with the arc extinguish chambers, plum blossom contact systems, fixed contact systems, capacitor assembling units, air cylinder systems, a mechanical drive system, ion capturing systems, compressed airpiston assembling units, intermediate contact assembling units, insulation supporting bars, moving end large shields and fixed end large shields; the arc extinguish chambers are of double-break structure and are symmetrically distributed, with the mechanical drive system as the center; the middle mechanical drive system moves along the vertical direction; and vertical movement of the mechanical drive system is transformed to horizontal movement through crankarms and connecting rods in the mechanical drive system to drive the two air cylinder systems of the arc extinguish chambers to move horizontally to switch off and switch on the switchgear. Through promoting the technology of the integral arc extinguish chamber of the breaker, the arc extinguish chambers have more uniform electrical field, high insulation level, stronger breaking capability and high current-carrying capability and is safer to operate.

The invention discloses a capacitive buffer type mixed high-voltage direct current circuit breaker and a control method thereof. The circuit breaker comprises a mechanical switch unit, a current conversion unit, a capacitive buffer unit and a mechanical switch energy supply unit, wherein the mechanical switch unit is formed by connecting at least one mechanical switch sub-unit in series; the mechanical switch sub-unit is formed by connecting a mechanical switch, a voltage sharing module and an energy-absorbing voltage-limiting module in parallel; the current conversion unit is formed by connecting a power electronic switch module and a voltage-limiting module in parallel; the power electronic switch module comprises at least one power electronic device; the capacitive buffer unit consists of capacitor banks and provides a current conversion buffer branch for fault current; the mechanical switch energy supply unit supplies electric energy to the mechanical switch, and the quickness and the coordination of the motion are ensured. The capacitive buffer type mixed high-voltage direct current circuit breaker and the control method thereof, provided by the invention, have the advantages that the capacitive buffer type mixed high-voltage direct current circuit breaker is simple in structure, convenient to control, high in speed, high in reliability, high in galvanization voltage resistance level, small in size and low in cost.

The invention discloses a high-voltage double-break circuit breaker. The high-voltage double-break circuit breaker comprises circuit breaker casings and driving mechanisms, wherein two arc extinguishing chambers are symmetrically arranged in the circuit breaker in a left and right manner, a certain distance is formed between the arc extinguishing chambers, movable cover-plate ends of the arc extinguishing chambers are oppositely arranged, a fixed contact and a movable contact are arranged in each arc extinguishing chamber, the movable contacts are electrically connected with each other and are connected with one ends of connecting-rod mechanisms, and the fixed contacts are led out of the arc extinguishing chambers; the driving mechanisms are connected with the other ends of the connecting-rod mechanisms at the same position through insulated tension rods, the driving mechanisms drive the insulated tension rods to move up and down so as to drive the connecting-rod mechanisms to synchronously move, and further the gathering movement and the separating movement of the movable contacts and the fixed contacts are synchronously realized, wherein the leading-out terminals of the two fixed contacts are used as the circuit access terminals of the circuit breaker. The high-voltage double-break circuit breaker disclosed by the invention solves the problem that the switching voltage of vacuum circuit breakers is not high, and besides, the time for opening or closing a brake is shortened; the mechanical structure is simple, and the reliability of the circuit breaker is improved.

The invention discloses a three-fracture double-acting type high-speed permanent magnet repulsion switch and a method of the three-fracture double-acting type high-speed permanent magnet repulsion switch and belongs to the field of direct-current switches. The three-fracture double-acting type high-speed permanent magnet repulsion switch comprises a switch body, high-speed electromagnetic repulsion mechanisms, permanent magnetic operating mechanisms, contact springs, insulation pull rods, opening driving circuits, closing driving circuits, a detecting unit and a control unit. Each moving contact is connected to one end of one insulation pull rod through one contact spring, the other end of each insulation pull rod is connected with a driving rod, and each driving rod penetrates through a metal disc in one high-speed electromagnetic repulsion mechanism and is connected with a moving iron core; the control unit is respectively connected with a detecting circuit, the opening driving circuits and the closing driving circuits; each opening driving circuit is connected with an opening coil and each closing driving circuit is connected with a closing coil. According to the three-fracture double-acting type high-speed permanent magnet repulsion switch, a fracture with a large opening distance is formed at a short time and the opening speed of the switch is increased; meanwhile, according to the switch, the two moving contacts and two fixed contacts are in contact in sequence, so that when opening operation is conducted, the problems of movement dispersibility generated when multiple switches are independently driven and the like are solved.

The invention relates to parallel type circuit breakers based on a tightly coupled air reactor, belonging to the field of high-voltage and high-capacity circuit breaker devices. The invention aims at automatic current sharing and current limiting. Parallel operation of the circuit breakers is realized by adopting the tightly coupled air reactor. The current input ends on two arms of the tightly coupled air reactor are positioned at the same side of the reactor, are short connected and are connected into a system by being welded with a wiring board, the current output ends on the two arms are respectively connected with two circuit breakers after being welded with the wiring board, and the other ends of the circuit breakers are short connected and connected with the system, therefore, the whole parallel type circuit breaker devices based on the tightly coupled air reactor are connected into the system in series, and the wiring board at the output end of the tightly coupled air reactor is supported by a post insulator and is fixed on a prefabricated platform. The circuit breakers are connected in parallel by adopting the tightly coupled air reactor, thereby breaking the short-circuit current by times and improving the entire breaking capability.

The invention discloses a direct-current contact switch breaking protective circuit and an alternating-current contactor equipped with the direct-current contact switch breaking protective circuit. The direct-current contact switch breaking protective circuit comprises a capacitor, a diode, and a discharging path of the capacitor, wherein the discharging path is in a parallel connection with the diode, one end of the capacitor is coupled with a positive electrode end of a direct-current contact switch, the other end of the capacitor is coupled with a positive electrode of the diode, and a negative electrode of the diode is coupled with a negative end of the direct-current contact switch. According to the invention, electric arcs can not be generated at all between contacts when the switch breaks a direct-current high voltage and a high current, the breaking ability and allowable breaking times of the direct-current contact switch are increased, the service life of the direct-current contact switch of the alternating-current contactor equipped with the breaking protective circuit is prolonged significantly.

The invention relates to a circuit-breaker automatic closing contact device with high breaking capacity, which comprises a contact support, a rotating shaft, a fixed contact, a rotary dual-breakpoint moving contact installed on the contact support and a contact spring. The fixed contact and the moving contact are symmetrically distributed in relative to the rotating shaft, and an operating mechanism and an electromagnetic mechanism respectively drive the contact support to rotate through a control part of the operating mechanism and a control part of the electromagnetic mechanism of the contact device. Spring fixing shafts are symmetrically arranged on a shell on both sides of the contact support, one end of the contact spring is abutted against the shell, the other end is butted upon a torsion spring contact wire of the contact support, and the contact spring applies a torsion spring force to the contact support in the contact closing direction through the torsion spring contact wire. The automatic closing contact device without exogenic action has high breaking capacity, minimizes the influence of the contact spring on the breaking resistance of the moving contact while not reducing the reliable closing property of the contact, increases the breaking speed and the reliability of the contact and reduces arcing risk.

The invention discloses an air-swirl type spout high-voltage gas-blast circuit breaker with vanes, relating to the electrical switch field. The invention comprises a piston, an air cylinder, movable main contacts, movable arc contacts, stationary main contacts, stationary arc contacts and a spout; vanes are evenly arranged at the circumference of the inner wall of the upper part of the spout at which the spout and the movable arc contacts are formed into an air channel, so an air swirl area is formed. The axial movement of the air flow passing through the upper part of the spout is automatically converted into rotary movement, so the arc-extinguishing ability and the breaking capacity of the gas-blast circuit breaker are enhanced.

The invention discloses a synchronous measuring device and synchronous measuring method of an arc and contact moving process based on laser imaging. The device comprises a short-circuit current generating device, a CW-laser illuminator, a high-speed photographic device, an electric parameter measuring device and a digital delay pulse generator, wherein the digital delay pulse generator is used for simultaneously triggering the short-circuit current generating device, the high-speed photographic device and the electric parameter measuring device, the short-circuit current generating device is used for outputting short-circuit current to generate an arc in a breaker to be tested; the CW-laser illuminator is utilized to transmit continuous laser as a background light source, and the morphological evolution of the electric arc in the breaker to be tested, the motion of the contact and the interaction of the electric arc and the contactor can be simultaneously shot by the high-speed photographic device in a strong electric arc illumination condition. According to the synchronous measuring device provided by the invention, the air on-off process can be deeply and completely understood, and the directly beneficial scientific basis can be provided for electric arc evolution, electric arc evolution, a relationship between clearance between open contacts and the like.

A metal plate of a recording tape cartridge is provided with a tapered portion at an outer circumference thereof. In a state in which the metal plate is attached at a fixed-side mold plate of a metal mold for molding a reel hub and a lower flange, a gap is formed between the tapered portion and the fixed-side mold plate. During molding, molding material flows into the gap. Because of this gap, an annular pawl portion is formed at the reel hub, which annular pawl portion integrally joins the metal plate with the reel hub by sandwiching the metal plate via the tapered portion.

The invention relates to the technical field of motor control, in particular to a method for realizing medium phase zero-breaking and zero-closing by a control protection switch. The control protection switch is a carrier to realize the method, and comprises a central processing module and a contactor module. The method is characterized by comprising the following steps that: a main CPU singlechip of the central processing module acquires a voltage signal through a voltage signal acquisition circuit, and acquires a current signal through a current signal acquisition circuit; then a three-phase electricity zero-crossing point period is compared with electrified closing mechanical time and power off breaking mechanical time of the contactor module; and a closing or breaking signal after judgment is sent so as to close or break the contactor module of the control protection switch on the medium phase zero point of the three-phase electricity. The method is a simple and effective method for relieving the overvoltage and overcurrent impact, improves service life of the switch body, reduces abrasion of a contactor material, and reduces consumption of noble metal resources.

The invention relates to a breaker with a forced flash barrier device. The breaker comprises a shell, a movable contact and a fixed contact, wherein the shell is internally provided with a lever made of an insulating material and composed of a left moment arm, a right moment arm and a fulcrum, the left moment arm of the lever is inserted into a gap between the movable contact and the fixed contact since the right moment arm is pushed rightwards by the movable contact during the separation process of the movable contact and the fixed contact, and the left moment arm of the lever goes out of the gap between the movable contact and the fixed contact since the left moment arm is pushed leftwards by the movable contact during the closing process of the movable contact and the fixed contact. The breaker is simple in structure and reliable in movement, can quickly cut off an electric arc when the movable contact and the fixed contact are separated so as to improve arc voltage, increase the breaking capacity and the current-limiting capacity of the breaker, widen the application range of the breaker and realize reversible protection.

The invention provides therapeutics and methods to induce a mammalian host, including a human, to produce antibodies, which agonize death receptors and cause the apoptotic death of target cells within the host's body. The therapeutics are vaccine compositions, including genetic vaccines encoding death receptor antigens of the tumor necrosis factor receptor family. Also provided are means and methods for overcoming host immunological tolerance to death receptors. The vaccines are useful against cancer cells and other death receptor bearing target cells within the host, and can be used in both therapeutic and prophylactic settings. The vaccines are also useful for diagnostic testing of the immunocompetence of a host.

The invention relate to breaker, especially to super high-voltage circuit breaker in use for GIS. The disclosed breaker includes breaking contactor mechanism, and operating mechanism for switching on / off resistances, and controlling action of breaking contactor mechanism. Through pull rod and regulating lever, one set of operating mechanism can control two sets of breaking contactor mechanism since technique of adjusting compression spring for moving contactor is utilized. The invention possesses breaking function at double speed, reduces kinetic resistance of moving contactor, and quickens breaking speed. Stepped breaking technique adopted in the invention lowers over voltage of operation greatly, as well as increases rated capacity and breaking capacity greatly. The invention also reduces cost of equipment and difficulties for manufacturing the disclosed breaker.

The invention provides an arcless DC circuit breaker and a using method thereof. The circuit breaker adopts a mode of combining magnetic induction transfer and resistor current limiting. The circuit breaker comprises a main current circuit and a transfer current circuit; the transfer current circuit has a bridge structure, a group of one-way modules with a breaking function is used for realizing two-way breaking of the current, and compared with the existing structure, the use amount of breakable devices can be reduced half. Through controlling the action time sequence of a triggering gap, a high-speed switch and a power semiconductor, arcless opening of a fast switch of the main current circuit is realized, and the breaking ability of the circuit breaker is improved significantly. A current limiting module circuit inside the transfer current circuit is used for quickly limiting the short circuit fault current, the parallel group number of wholly-controlled devices of the breaking module circuit can be reduced. Compared with the existing circuit breaker structure, the use amount of breakable devices can be reduced greatly, and the cost of the circuit breaker is reduced significantly.

The invention discloses an air-swirl type spout high-voltage gas-blast circuit breaker with grooves, belonging to the electrical switch field. The invention comprises a piston, an air cylinder, movable main contacts, movable arc contacts, stationary main contacts, stationary arc contacts, a cover for the moveable arc contacts and a spout. The invention is characterized in that spiral grooves are evenly arranged axially in an air flow channel formed by the spout and the cover for the movable arc contacts, or on the inner surface of the spout, or on the outer surface of the cover for the movable arc contacts, or on the inner surface of the spout and the outer surface of the cover for the movable arc contacts , so an air swirl area is formed, and the arc-extinguishing ability and the breaking capacity of the gas-blast circuit breaker are enhanced.

The invention relates to a double-power-source automatic change-over switch comprising a controller, a change-over device, a contact system, and micro switches. The change-over device comprises a mechanism frame, a motor, a gear reversing assembly, and a change-over assembly. The change-over assembly comprises a transmission disc and two transmission arms. The two transmission arms are each equipped with an energy storage mechanism. A first transmission component and a second transmission component are respectively fixed to the upper end faces of the two transmission arms. The upper ends of the first transmission component and the second transmission component are correspondingly installed on a first moving contact support and a second moving contact support of the contact system. The two transmission arms are respectively arranged at the two sides of the transmission disc. The transmission disc includes two rotating plates and two shifting rods. The two transmission arms are each provided with clamping grooves corresponding to the shifting rods. The shifting rods can slide in the corresponding clamping grooves when rotating along with the transmission disc, and the two shifting rods can drive the corresponding transmission arms to rotate. The double-power-source automatic change-over switch of the invention has the advantages of small size, strong breaking capacity, and stable and reliable performance.

The invention discloses a high-voltage DC relay and an assembly method thereof. The high-voltage DC relay comprises two fixed contacts and a movable assembly, wherein the movable assembly comprises a movable spring part, a main spring and a push rod assembly, the push rod assembly comprises two independent parts of a push rod part and an U-shaped basket, the push rod part comprises a fixed piece and a push rod which are fixed together by insulation plastic, the two ends of the fixed piece are respectively fixed with the bottom of the side part of the U-shaped basket after the main spring, the movable spring part and the U-shaped basket are sequentially arranged at the top of the push rod part, so that the main spring is elastically tightened between the bottom surface of the movable spring part and the insulation plastic of the push rod part, and a movable spring piece props against the inner side of the top of the U-shaped basket. By dividing the push rod assembly into two independent parts, the high-voltage DC relay has the characteristics of simplicity in structure, convenience in forming and easiness in ensuring size accuracy; meanwhile, the two parts are easy to assemble, and automatic assembly of parts which are mutually matched is easily achieved; and moreover, the bonding resistant ability also can be enhanced.

An interlocking vacuum switch and a series compensation type current limiting device and method based on the same are provided. The switch uses an interlocking vacuum interrupter. A fast repulsion mechanism is selected to cooperate with the interlocking vacuum interrupter to realize fast switching of the series compensation type current limiting device between the two functions of series compensation and current limiting. When the line of a traction network runs normally, a series compensation capacitor is accessed, and the device works in a series compensation state. When the line is short-circuited, an interlocking vacuum switch acts to short-circuit the capacitor, and a current limiting reactor is put into use in the system to limit the short circuit current of the line. Inside the sameinterrupter, a main static contact and a main moving contact constitute a first contact group to switch on / off the current limiting reactor, and an auxiliary static contact and an auxiliary moving contact constitute a second contact group to switch on / off the compensation capacitor. A single vacuum interrupter and a set of operating mechanism are adopted to realize the switching of a traction system between the functions of series compensation and current limiting. The volume cost and economic cost of the device can be reduced, and the reliability of the system can be improved.

The invention discloses a zero arc extinguishing device. The arc extinguishing device comprises an arc separation cover, an arc striking sheet, two arc separation walls, grid sheets and one or more than one group of arc extinguishing sheets, wherein each group of arc extinguishing sheets comprises an insulating frame, an arc extinguishing plate and a de-ionization net. The top parts of two arc extinguishing walls are connected through the arc separation cover; two or more than two pairs of longitudinal slots are machined on the inner walls of the two arc separation walls; the two or more than two grid sheets are sequentially inserted into the slots forwards and backwards; and the arc striking sheet is inserted into the slots at the end parts of the arc separation walls. The one or more than one group of arc extinguishing sheets is installed between the top parts of the grid sheets and the arc separation cover. In order to increase a cooling area of the grid sheets on electric arcs, the tops of the grid sheets abut against the insulating frame, the bottoms of the grid sheets are arranged stepwise along an inclining surface of the arc striking sheet without contacting the arc striking sheet, and the length of the grid sheets can reach the range from 1 / 2 to 2 / 3 height of an arc extinguishing chamber. Compared with the traditional arc extinguishing chamber, the arc extinguishing device can realize the effects of small size, high breaking and zero arc.

The invention discloses a control and protection device of a low-voltage apparatus. The control and protection device of the low-voltage apparatus comprises a base and a control and protection module which is arranged on the base in a pluggable mode and interchangeable. The base comprises a base seat and a housing, and the inside of the base is provided with a moving contact, a fixed contact and a main loop current conductor; a control electromagnet and an operation mechanism which control and maintain the contact and the separation of the fixed contact and the moving contact according to control signals; a manual operation knob which provides the control signals of controlling the contact and the separation of the fixed contact and the moving contact; a control contact which is connected to the manual operation knob; and a current sensor which is used for detecting the current flowing through the main loop current conductor to generate sensing signals. The inside of the control and protection module is provided with a signal processing unit which controls the status of the control electromagnet through an electric circuit according to the sensing signals; and a tripping device which responds to the signal processing unit to control the actions of the operation mechanism through a mechanical connection mode.

An arc extinguishing chamber of a 40.5kV SF6 circuit breaker includes an upper connection terminal and a lower connection terminal closely installed on the up and down ends of a porcelain set, a static contactor device connected with the upper connection terminal and a dynamic contactor device connected with the lower terminal in the set, in which, a static arc contactor in the static contactor device and a dynamic arc contactor in the dynamic device are matched radially in gaps characterizing that the inner diameter of the static arc contactor is matched with the outer diameter of the dynamic arc contactor in gaps, the outer diameter of the static arc contactor is 35-41mm, the arc chamfer radius of the end of the static arc contactor is 2.75mm so as to improve distribution of electric fields.

The invention relates to a PC-class automatic changeover switch device with an energy storage mechanism. The device comprises a base, a contact system which is arranged on the base, the energy storage mechanism which is in transmission connection with the contact system and a drive motor which is in transmission connection with the energy storage mechanism, wherein the drive motor is fixed on the base through a motor support; the energy storage mechanism comprises an energy storage support unit, an energy storage gear, an energy storage handle, an energy storage spring assembly and an energy storage cam, wherein the energy storage support unit is fixedly connected to the motor support; the energy storage gear is arranged in the energy storage support unit and is in transmission connection with the drive motor; the energy storage handle which is arranged above the energy storage gear and the bottom of the energy storage handle which is engaged with the energy storage gear; the energy storage spring assembly cooperates with the energy storage gear; and the energy storage cam is coaxial to the energy storage gear, is arranged at the outer side of the energy storage support unit and is in transmission connection with the contact system. Compared with the prior art, the device has simple and compact overall structure and convenient processing and manufacturing, and the energy storage mechanism is provided, so that when the automatic changeover switch rotates, the phenomenon of clamping stagnation or failed linkage cannot occur, and the device is safe and reliable.

A semiconductor device includes: a transistor region including an IGBT having a gate electrode and an emitter electrode; a termination region placed around the transistor region; and an extraction region placed between the transistor and the termination region and extracting redundant carriers. A P-type layer is placed on an N-type drift layer in the extraction region. The P-type layer is connected to the emitter electrode. A dummy gate electrode is placed via an insulation film on the P-type layer. The dummy gate electrode is connected to the gate electrode. Life time of carriers in the termination region is shorter than life time of carriers in the transistor region and the extraction region.

The invention discloses a pressure-operated load switch for a gas-insulated ring main unit. The pressure-operated load switch comprises a support, an upper support plate, a lower support plate, support insulators, an insulating cylinder, a fixed contact, a nozzle, a movable contact, a compressor sleeve, a conductive tube, a contact seat, a main shaft, a crank arm system and a guide rod, wherein a first high-voltage shielding case and a second high-voltage shielding case are arranged outside the insulating cylinder; the internal structure of the insulating cylinder forms a load switch arc-extinguishing chamber; the load switch arc-extinguishing chamber is fixed on the support through the support insulators and the upper support plate; the guide rod is fixed on the support through the lower support plate and the support insulator; the fixed contact and the movable contact adopt arc striking contact and conductive contact all-in-one structures; and airvents are formed on the fixed contact. The pressure-operated load switch has the advantages of small size, simple contact system, strong on / off capability, high action stability and long service life.

The utility model relates to a contact system of an electrical appliance with an automatic shift switch, which consists of a shell, a moving contact component, a static contact component and an interrupter. A side of the shell is sunken and forms a setting hole with a moving contact component and a component setting hole with a static contact; the two ends of the moving contact component form the moving contact with a finger-shaped assembling type and the static contact with a knife-shaped plug-type; the static contact component consists of two finger-shaped assembling type static contacts and two static contacts with knife-shaped plug-type; the interrupter is arranged between two static contacts with finger-shaped assembling type and the moving contact with finger-shaped assembling type. The invention provides the contact system of automatic switch electrical appliance which integrates the traditional finger-shaped assembling type contact with knife-shaped plug-type contact together. The invention uses the integration of the finger-shaped assembling type contact and the interrupter to reach a higher requirement of connecting capacity and breaking capacity. Besides, the invention can use a mutual compensation of the repulsion force of the crunode of the finger-shaped assembling type contact and the electrical suction of the crunode of the knife-shaped plug-type contact, so as to improve the short circuit resistance capacity of the switch electrical appliance.